Question about 1996 Isuzu Rodeo

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!996 Isuzu rodeo some times starts

The starter will turn over it is standard 4 cyl no spark and also no power to the feul pump a day later it wil start and run then later it won't start at all the starter will always turn over, I was thinking it was the ICM replaced every thing new Ignition coil Feul pump Even put the feul pump direct nothing. if it is the icm can a high perfomance one be put in as replacement,and if so who might have them

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When you have no spark only it could be the ignition module. when you have no gas delivery only it could be a relay. However when both are missing. It is either your crankshaft sensor or the engine computer. Good luck. also see if the injectors are pulsing.

Posted on Dec 28, 2008

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My 2003 Saab 9-5 Aero 4-cyl Turbo Won't start. However, I have power in car, lights windows and radio works. But it won't turn-over. It could be Starter or Starter Relay. I can't find out


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If the engine is turning, but slow, she may need the battery terminals cleaned, if it has sat for over a year, yes, it may need a new battery. If the engine is turning over and she is not cranking up. Standard rules apply... does she have fuel? does she have spark, does she have compression? First thing is easy, get a can of starting fluid and give her a spray in the air filter area during cranking, if she pops off you have spark, which means no fuel. If it does not try to hit, that means no spark and more trouble shooting will need to be done. If it starts on starting fluid, you may have a bad fuel pump. AS gas turns to gunk as it dries up. And that may have gummed up the pump and filter. Hope this helps FixYa up.

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The electric fuel pump is controlled by a relay in the fusebox.
It normally only goes on for a few seconds, and then if the alternator does not signal the engine is running, the relay is supposed to shut the pump off. But you can shunt the secondary wires of the relay to keep it on if you want to check fuel pressure.

Try some starting fluid spray to make sure the ignition is good.
It will at least sputter on the spray, if there is spark.

Here is a picture of an Aztek fuel pump relay:

http://cgi.ebay.com/ebaymotors/Standard-Motor-Products-RY484-Fuel-Pump-Relay-_W0QQcmdZViewItemQQfitsZMakeQ3aPontiacQ7cModelQ3aAztekQQhashZitem45f786818dQQitemZ300505530765QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

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1 Answer

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could be a number of things......engines need spark fuell and air to run.....one of three in your case is not working correctly
try disconnecting fuel line from engine side of feul sending unit and turn over ....get a bucket it could get messy....if you see fuel then check spark...to check spark leave fuel disconnected....and pull out one plugs leave wire on plug and touch plug threads to ground (anyground..eg..alternator bracket)use vice grips but not too tight ..then turn it over again and see if plug sparks......if spark and fuel are present ....then ur into crank sensors or cam sensors these determine when spark is present.....

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You may have lost a ground, blew the coilover, or blew a sensor. Probably the crank position sensor.
Hightower.

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